Have been trying to save a small hallway as a prefab. I highlight the hall
and copy it. But when I go to save prefab it isn't lite up. The hall is made
up of four blocks textured and all are highlighted at the same time. Am I
missing something? This was suppose to be a way of constructing levels in a
hurry with prefab hall sections that I could line up!
Thanks

I havn't used this option before, but I took a few seconds to test it out. The objects must be grouped together first...

[menu] Object -> group together

Then you can save them as a prefab